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TO ALL WHOM I T MAY CONCERN: Y

Beit known that I, BARTON H. JENKS, of Bridesburg, in the countyA ofPhiladelphia, and Stateof Penn- Sylvania, have invented an Improvementin Cams for Operating lreadles in Looms for Tweeling; and` I do herebydeclare' that the following is a full, clear, and exact descriptionthereof, reference being had to the accom panying drawings, making apart of this specification, in which# Figure 1 is a horizontal sectioncfa loom taken above the cam-shaft, showing myimproved-eam applied toit.

Figure 2 is an enlarged view ofone of the improved grooved cams.` I

Figure 3 is an end view -of the same.

Figure '4 shows in a cross-sectiou the two parts of the groov'edcamdetached. v

Similar letters of reference indicate corresponding parts in the severaligures.

This invention relates to an improvement on looms which are designed forweaving twilled fabrics, and in which reciprocating cams are employed'as described in the patent of Richard Garsed, whichwas grunted on i the20th day of July, 1846, and extended onthe 18th day of July, 1860, andsubsequentlyassigned.to me In this loom of Garsed tho cams are placedupon the middle or" the cam-shaft between the intermediate bearingsthereof.` This cam-shaft'is also employed for driving other parts of theloom besides the treadles, such as the piek motion,thread-protectormotion, box motion, Sto. When a change was necessaryfrom one grooved hub or cam to anotl1er, having a greater or less numberof grooves, all the said connections were displaced, the

' cams removed from the shaft by sliding them oii endwise, the new camssubstituted for those last in use, and

adjusted -in proper position and relation to the treadles, after whichthe cams and. dogs for actuating other parts of the loom-abovereferrcd'towere adjusted upon the shaft Vin proper time and relation toeachother, requiring considerable labor, time,`and skill. Y

The object of myiinvcntion and improvement isto so construct the groovedhubs, s leevcs, or cams which a'ctuatc the trcadle-camaithat alltherequired. changes can be made for moving agreater or less number oftrcadles, or for. moving a givenj number of treadles in any requiredorder, by simply removing those `portions of said hubs or sleeves which'produce said changes, and without the necessity of removing thecam-shaft from itsbe'arings or disturbing such parts'as may be connectedto this shaft, as will be hereinafterdescribed.

To enable others skilledl in the art to understand my invention, I willdescribe its construction and operation. In the accompanying drawingsrepresents the cam-shaft, having the picker cams a a securedvpermanentlyto it in the.4 usual manuel-,land'C C are the harness cams for actingupon the treadles o, of which six are rcplresented', the number requiredfor three sets of-harnessfor weaving threeftwilled cloth. The cams C Care secured in a suitable manner-to cylindrical hubs, D D, that slidefreely on the shaft A in an endwise direction, and at the sametimefurnwith it by means of a feat-her or key tenen, c.v In Eg. 1 the hubs DD are each represented with three grooves, at equal distances apart,passing around its periphery.' On one side of' each hub the straightportions of the grooves run into other grooves passing obliquely over4the surface of the hub so as tointersect eachother, as shown,lin twodirections. F F represent two horizontal studs projeeting from the frameG, and on theinner endof each stud turnsa feather, d, which fits thegrooves inthe hubs' D freely, and which is made of such length, with`the'ends reduced in thickness, as to' pass the junctions of thediagonal portions of the grooves where they cross each other. When thediagonal portions of the-grooves pass the feathers, the smallestdiameter ofthe cams'C C passtlietreadle, at which time the cam andtreadles are not in Contact, and therefore the former are free to 4slideon the' shaft A without touching the treadles. By increasing the nnmberof grooves in each hub any desired number of treadles can he operated. l

Having described the manner of operating the treadles of looms forweaving twilled fabrics, I will novy describe my improved' mode ofconstructing the grooved hubs or cams D D, which give the ends/iscmovements to the treadle cams O C, so that the required changes can bemade without removing the main shaft A. from its bearings. The groovedhubA shown in figs; 2, 3, 4, and 5 consist-s of two parts or segments, Dand D', whichform a. complete cylinder when put together, as shown infigs. 2 and 3. The largest segment, D, is permanently, but loosely,applied on thecam-shaft A, and is secured rigidly to the cam C, whichworks the treadles. The smaller section or segment D isconstructed'with'lips or tcnonsupon its ends, which fit 'snugly intocorresponding recesses formed in the portion D, as Slro,wn`and bymeans'f screws this segment D is rmly secured to the segment D,tltinsforrning` zn perfect cylinder. That portion of the hub which ispermanently-,attached to the shaft A, but allowed to slide' endwisethereon, has straight and parallel grooves formed in its periphery,which are lettered gg g, and that portion or" the hub which is removablehas oblique or diagonal grooves,g g', g', formed in its periphery, whichgrooves are equal in width to the straight lor parallel grooves in theportion D, and form, together, channels for receiving the feather d, andcausing the hub and its cam C to receive an endwise reciprocatingmovement on the shaft .A when the latter is turned. The segment D',which has the oblique intersecting grooves formed in it, is maderemovable from the segment D for the purpose of employing anothersegment of the sume size and shape, when it is desired to employ a.greater or less number of-'grooves and ngreater or less number of'treuriles. Therefore, when a., change is required, it is only necessarytorcmove the diagonally grooved segment D and substitute a. dierentonewhich will give the required change. i

Having described my invention, what I claim as new, anddesireto secu reby Letters Patent, is Y Constructing the grooved hub -ofna trendleam, C,of' two-parts, substantially in the manner and for the purposedescribed.

` BARTON H, JENKS.

Witnesses:

WILLIAM DoBsoN, JOHN RUsswooD.

